MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Question

Please use the following information to answer question 9a & 9b:

A random sample of n = 16 scores is obtained from a population with a mean of µ = 45. After a treatment is administered to the individuals in the sample, the sample mean is found to be x̅ = 49.2.

9a. Assuming that the sample standard deviation is s = 20, calculate r2 (MUST SHOW WORK FOR THIS PROBLEM).

Note: You must provide calculations for the t-statistic, in addition to r2.

 

 

 

9b. Calculate Cohen's d to measure the size of the treatment effect (MUST SHOW WORK FOR THIS PROBLEM).

 

 

 

Comparing your answers from 8 (a&b) and 9 (a&b), fill in the blank to properly describe how the variability of scores in the sample influence the measures of effect size.

(8. A random sample of n = 16 scores is obtained from a population with a mean of µ = 45. After a treatment is administered to the individuals in the sample, the sample mean is found to be x̅ = 49.2.

9. A random sample of n = 16 scores is obtained from a population with a mean of µ = 45. After a treatment is administered to the individuals in the sample, the sample mean is found to be x̅ = 49.2.)

10. Measures of effect size tend to   with an increase in sample variance.

Note: Your response for this should either be increase, decrease, or remains constant.

 

 

 

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